AMERICAN MUTILLID.^. 261 



19. Head large, broad, squarely and considerably produced behind eyes; space 



between hind ocelli equal to but little more than half that between 

 them and eyes; first dorsal segment not banded with white pubes- 

 cence; legs testaceous pretiOMJssiinst D. T. 



Head ordinary rounded behind ; space between hind ocelli about equal to 

 that between them and eyes; first dorsal segment banded at apex with 

 white pubescence ; legs dark adonis n. sp. 



20. First abdominal segment distinctly longer than it is broad at ai)ex, not alto- 



gether sessile with the second 21. 



First abdominal segment shorter and broader, its length nearly equalled by 

 its width at apex, nearly sessile with second 27. 



21. Second dorsal segment distinctly punctured throughout 22. 



Second dorsal segment sparsely or not punctured medially 24. 



22. Ventral carina of first segment even, not prominent posteriorly 23. 



Ventral carina of first segment prominent or produced posteriorly, so that it 



is bisinuous, or bidentate pRiliila Blake. 



23. Space between hind ocelli slightly less than that between them and eyes; 



first segment rather strongly and evenly punctured ; legs daik. 



tapajos Blake. 

 Space between hind ocelli distinct less than that between them and eyes; 

 first segment sparsely punctured apically ; legs testaceous. 



auliiN Blake. 



24. Insect testaceous brown, venation dark, at least the stigma 25. 



Insect pale yellow, venation very pale, so as to be almost indistinct- ■ • • .26. 



25. Legs rather dark; thoi'ax castaneous; abdomen from second segment black- 



ish ; first segment rather strongly convex at apex .Maclejslcii D. T. 



Legs pale; head and thorax of a paler color than abdomen, hut the latter is 



not blackish ; first segment scarcely convex at ai)ex. .alenioii n. sp. 



26. Length 6-7 mm.; middle segment reticulated ; form elongate. 



acoiiaiiiM n. sp. 

 Length about 3 mm.; middle segment not reticulated ; form shorter. 



.4sliinea«lii Fox. 



27. Insect castaneous 28. 



Insect black ; wings pale fusco-hyaline thaitiyras n. sp. 



28. Wings subhyaline, not fuscous; head rather finely punctured ; legs concolor- 



ous with body Iiyaliiia Blake. 



Wings crossed by a fus(;ous cloud beyond stigma; head strongly jiunctured ; 

 legs dark sarpedon n. sp. 



FEMALES. 



Insect more or less clothed with a dense, appressed pubescence, in addition to 

 the longer, erect hairs 2. 



Insect without appressed pubescence, with erect hairs only 6. 



2. Second dorsal with appressed pubescence, which is quite long throughout; 

 first joint of fiagellum nearly as long as two following joints, pedicel 



short 3. 



Second dorsal with erect hairs only, the head and thorax with short, appressed 

 pubescence, that on apical segments longer, ferruginous; first joint of 

 fiagellum but little longer than the second, the pedicel elongate, 

 equalling it in length liyp«»rninestra n. sp. 



TRANS. AM. ENT. SOC. XXV. MARCH, 1899. 



